Coats Crochet-Aunt Lydia s Extra Fine Crochet Thread. High luster; mercerized cotton thread; Aunt Lydia s Classic Crochet Thread is perfect for delicate crochet projects both large and small. Available in traditional colors; Aunt Lydia s Classic Crochet is ideal for heirloom-quality home decorating and fashion projects Features: size 30; 100% mercerized cotton; 500 yds/457m. Recommended crochet hook: 12 (.75mm). Care: machine wash gentle (max.temp 104F/40C); roll in towel & block; do not bleach; do not dry clean; do not iron. Imported.